CN211267010U - System for adjusting code stream rate based on wireless channel signal-to-noise ratio - Google Patents
System for adjusting code stream rate based on wireless channel signal-to-noise ratio Download PDFInfo
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- CN211267010U CN211267010U CN202020384397.XU CN202020384397U CN211267010U CN 211267010 U CN211267010 U CN 211267010U CN 202020384397 U CN202020384397 U CN 202020384397U CN 211267010 U CN211267010 U CN 211267010U
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Abstract
The utility model discloses a system based on code stream rate is adjusted to wireless channel SNR, combine the video transmission basic station to use, detect signal strength (RSRP) and the signal to noise ratio (SINR) of wireless channel who receives the video transmission basic station through video transmitting terminal, calculate the adjustment method of encoder code stream rate, and through special wireless network transmission video signal, guarantee the stability of video live broadcast wireless signal transmission, overcome the shortcoming that traditional wireless transmission technique easily receives the environmental disturbance influence, be applicable to sports events, the evening party, the application scene of environment complicacy such as concert.
Description
Technical Field
The utility model belongs to the technical field of the live video technique and specifically relates to a system based on wireless channel SNR adjustment code stream rate is related to.
Background
In the live broadcast process of television video programs, the requirement on signal sources is very high, so that the conditions of mosaic, pause and frame loss cannot occur to ensure the stability of video transmission.
In recent years, with the development of communication technology, more and more new technologies are applied to the field of broadcasting and television, and in order to enrich the pictures of programs and improve the audience rating of television stations, more and more wireless stations are adopted to transmit video signals.
The traditional wireless transmission technology, no matter microwave, or public network 4G network, is susceptible to environmental interference to affect the stability of video transmission. If people shelter from, building shelter from, personnel intensive live broadcast place, such as sports event, evening party, concert etc., the code stream rate of transmission is basically unadjustable, and the quality and stability of video transmission are influenced easily by the change of environment, so a new wireless transmission method is needed, which can satisfy the complex transmission environment and ensure the stability of video transmission.
Disclosure of Invention
The utility model discloses an overcome prior art's not enough, provide a system based on wireless channel SNR adjustment code stream rate, guarantee the stability of video live broadcast radio signal transmission, overcome traditional wireless transmission technology and easily receive the shortcoming of environmental disturbance influence, be applicable to the application scene that the environment is complicated such as sports event, evening meeting, concert.
In order to solve the technical problem, the utility model adopts the following technical scheme:
a system for regulating code stream rate based on signal-to-noise ratio of wireless channel is composed of video transmission base station, video transmitting terminal and video-audio decoder connected to said base station
The video transmitting terminal acquires video and audio signals, performs video and audio coding, encodes and debugs signals of an IP data stream, performs signal amplification through a power amplifier and transmits the signals to the video transmission base station;
and the video transmission base station restores the wireless video signal of the video transmitting terminal into an IP data stream after receiving the wireless video signal, and the IP data stream is restored into an SDI video and audio signal through the video and audio decoder and is transmitted outwards.
Preferably, the video transmitter further comprises a camera connected with the video transmitting terminal to send SDI audio and video signals to the video transmitting terminal.
Preferably, the device further comprises a monitor, and the IP data stream is restored into an SDI audio-video signal by the audio-video decoder and sent to the monitor for picture display and sound playing.
Preferably, the video transmission base station manages and coordinates the video transmission terminal after receiving the wireless video signal.
Preferably, the video transmitting terminal comprises a video and audio encoder, a CPE, a power supply battery, a power amplifier module and a transmitting antenna;
the video and audio encoder compresses and encodes SDI signals, converts high-definition video pictures into codes of low code streams and outputs the codes to the CPE;
and the CPE encodes and modulates the encoded IP data stream by a channel, outputs a radio frequency signal, amplifies the radio frequency signal by a power amplification module, outputs the radio frequency signal to the transmitting antenna, and finally sends the radio frequency signal to the wireless video transmission base station through the transmitting antenna.
When the video and audio encoder compresses and encodes SDI signals, converts high-definition video pictures into codes of low code streams and outputs the codes to the CPE, signals of different formats input by various cameras and SDI embedded audio input are automatically identified, and the code stream rate and the resolution of output video streams are set.
Preferably, the CPE module receives a signal sent by the video transmission base station, and analyzes the signal to obtain a reference signal received power value RSRP and a signal to interference plus noise ratio SINR of the system; and respectively comparing the RSRP value with the SINR value and the reference value, and adjusting the code rate speed by setting different code stream rate grades.
In order to solve the above technical problem, the utility model also provides a method for adjusting code stream rate based on wireless channel signal-to-noise ratio, include at least following step:
s1: the method comprises the following steps that a video camera acquires SDI video and audio signals and sends the SDI video and audio signals to a video transmitting terminal for video and audio coding to obtain IP data streams;
s2: coding and debugging signals of the IP data stream, amplifying the signals through a power amplifier to obtain wireless video signals, and sending the wireless video signals to a video transmission base station through a transmitting antenna;
s3: the wireless video transmission base station receives the wireless video signal and restores the wireless video signal into an IP data stream;
s4: the audio and video decoding restores the IP data stream in the step S3 into a plurality of SDI signals and transmits the SDI signals outwards;
s5: the video transmitting terminal receives the signal sent by the video transmission base station and analyzes the signal to obtain a reference signal received power value RSRP and a signal-to-interference-plus-noise ratio (SINR) of a system; and respectively comparing the RSRP value with the SINR value and the reference value, and adjusting the code rate speed by setting different code stream rate grades.
Wherein, step S5 specifically includes:
the CPE in the video transmitting terminal detects that the RSRP is smaller than a fixed value, and if the SINR is larger than or equal to S1, the code stream rate of the video and the audio is set to be R1; if S2 is not more than SINR < S1, setting the code stream rate of the video and audio to be R2; if S3 is not more than SINR < S2, setting the code stream rate of the video and audio to be R3; if the SINR is less than S3, setting the code stream rate of the video and audio to be R4;
wherein S1, S2, S3 in the SINR represent a first threshold, a second threshold and a third threshold, respectively;
r1, R2, R3 and R4 respectively represent a first code stream rate, a second code stream rate, a third code stream rate and a fourth code stream rate.
If the CPE in the video transmitting terminal detects that the RSRP is larger than or equal to the fixed value, the code stream rate of the video and the audio is set to be R1.
Be different from prior art, adopt the utility model discloses possess following beneficial effect:
the utility model discloses in, combine the video transmission basic station to use, detect the signal strength (RSRP) and the signal-to-noise ratio (SINR) of wireless channel who receives the video transmission basic station through video transmitting terminal, calculate the adjustment method of encoder code stream rate, and through special wireless network transmission video signal, guarantee the stability of the live broadcast wireless signal transmission of video, overcome the shortcoming that traditional wireless transmission technique is easily influenced by environmental disturbance, be applicable to the application scene that the environment is complicated such as sports competition, evening meeting, concert.
Drawings
Fig. 1 is a schematic block diagram of a system for adjusting a code stream rate based on a signal-to-noise ratio of a wireless channel according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a video transmitting terminal according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of the method for adjusting the code stream rate based on the signal-to-noise ratio of the wireless channel in the embodiment of the present invention to achieve the adjustment of the code stream rate.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
As shown in fig. 1, a specific embodiment of the present invention provides a method for adjusting code stream rate based on wireless channel signal-to-noise ratio in live video, the system thereof is composed of a video transmission base station, a video transmitting terminal and a video/audio decoder, and a monitor and a camera are collocated for use: the SDI video and audio signals of the camera are sent to a video transmitting terminal for video and audio coding, then the IP data stream is subjected to signal coding and debugging, and then the signals are amplified through a power amplifier and sent to a video transmission base station through a transmitting antenna; the video transmission base station receives the wireless video signal of the video transmitting terminal and restores the wireless video signal into an IP data stream, and meanwhile, the management and coordination of the video transmitting terminal are realized; the IP data stream is restored into SDI video and audio signals through a video and audio decoder and then is sent to a monitor for picture display and sound playing.
As shown in fig. 2, the video transmitting terminal in this embodiment includes a video-audio encoder, a CPE, a power supply battery, a power amplifier, and a transmitting antenna; the SDI signals shot by the camera are compressed and coded through a video-audio coder, so that high-definition video pictures are converted into low-code-stream codes to be output to CPE, signals with different formats input by various cameras can be automatically identified, SDI embedded audio input is supported, and parameters such as code stream rate, resolution and the like of output video streams can be set; the CPE realizes the coding and modulation of the channel of the coded IP data stream, outputs a radio frequency signal, amplifies the radio frequency signal through a power amplification module and transmits the signal through a transmitting antenna. Meanwhile, the video transmitting terminal can tap the value of the Signal to Interference plus Noise Ratio (Signal to Interference plus Noise Ratio) from the Signal transmitted by the wireless video transmission base station to the RSRP (Reference Signal Receiving Power) and the SINR (Reference Signal Receiving Power).
As shown in fig. 3, when a CPE in a video transmitting terminal detects that an RSRP value received from a video transmission base station is smaller than a certain fixed value, the value is assumed to be n (the value can be set by the video transmitting terminal), that is, when the RSRP is smaller than n, a function of adjusting the code stream rate for SINR is activated, and if the RSRP is greater than or equal to n, the adjusting function is not activated, and the default code stream rate is R1. It should be noted that the value of n should be set according to the actual usage, and cannot be set too large, if it is too large, it means that the video transmitting terminal is closer to the video transmission base station, and the received power is stronger, and if the SINR value changes too fast at this time, it is meaningless to adjust the code stream rate, because it should eliminate the external interference or change the frequency first.
In the case of RSRP < n, the following discussion is made:
if the SINR is larger than or equal to S1, setting the code stream rate of the video and audio to be R1;
if S2 is not more than SINR < S1, setting the code stream rate of the video and audio to be R2;
if S3 is not more than SINR < S2, setting the code stream rate of the video and audio to be R3;
if the SINR is less than S3, the code stream rate of the video and audio is set to be R4.
Wherein S1, S2, S3 in the SINR represent a first threshold, a second threshold and a third threshold, respectively; and
r1, R2, R3 and R4 respectively represent a first code stream rate, a second code stream rate, a third code stream rate and a fourth code stream rate, and all parameter values can be set through a video transmitting terminal, so that the video transmitting terminal is more flexible to use and can be suitable for more scenes.
In a specific embodiment, a preset fixed value of n = -95dBm, the three thresholds being S1=15, S2=10, S3=6, respectively; the values of the four code stream rates are: r1=4Mbps, R2=3Mbps, R3=2Mbps, R4=1 Mbps.
Namely, in case that the CPE detects the reference signal received power value RSRP < -95dBm of the system in the video transmitting terminal:
when the signal to interference plus noise ratio satisfies that the SINR is more than or equal to 15, setting the code stream rate of the video and audio to be 4 Mbps;
when the signal to interference plus noise ratio SINR meets the condition that the SINR is more than or equal to 10 and less than 15, setting the code stream rate of the video and audio to be 3 Mbps;
when the signal to interference plus noise ratio SINR meets the condition that the SINR is more than or equal to 6 and less than 10, setting the code stream rate of the video and audio to be 2 Mbps;
and when the signal to interference plus noise ratio SINR meets the SINR <6, setting the code stream rate of the video and audio to be 1 Mbps.
When the CPE in the video transmitting terminal detects that the reference signal receiving power value RSRP of the system is more than or equal to-95 dBm, the adjustment of the SINR is not needed to be started, and the code stream rate of the video and audio is set to be 4Mbps by default.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (7)
1. A system for adjusting code stream rate based on wireless channel signal-to-noise ratio is characterized by comprising a video transmission base station, a video transmitting terminal and a video and audio decoder which are connected with the video transmission base station, wherein the video transmitting terminal and the video and audio decoder are connected with the video transmission base station
The video transmitting terminal acquires video and audio signals, performs video and audio coding, encodes and debugs signals of an IP data stream, performs signal amplification through a power amplifier and transmits the signals to the video transmission base station;
and the video transmission base station restores the wireless video signal of the video transmitting terminal into an IP data stream after receiving the wireless video signal, and the IP data stream is restored into an SDI video and audio signal through the video and audio decoder and is transmitted outwards.
2. The system according to claim 1, further comprising a camera coupled to the video transmitter terminal for sending SDI audio/video signals to the video transmitter terminal.
3. The system of claim 1, further comprising a monitor, wherein the IP data stream is processed by the video/audio decoder to recover SDI video/audio signal, and is sent to the monitor for displaying pictures and playing sound.
4. The system according to claim 1, wherein the video transmission base station manages and coordinates the video transmission terminals after receiving the wireless video signals.
5. The system for adjusting the bit stream rate based on the signal-to-noise ratio of the wireless channel according to any one of claims 1 to 4, wherein the video transmitting terminal comprises a video-audio encoder, a CPE, a power supply battery, a power amplifier module and a transmitting antenna;
the video and audio encoder compresses and encodes SDI signals, converts high-definition video pictures into codes of low code streams and outputs the codes to the CPE;
and the CPE encodes and modulates the encoded IP data stream by a channel, outputs a radio frequency signal, amplifies the radio frequency signal by a power amplification module, outputs the radio frequency signal to the transmitting antenna, and finally sends the radio frequency signal to the wireless video transmission base station through the transmitting antenna.
6. The system according to claim 5, wherein the video-audio encoder compresses and encodes SDI signals, converts high definition video pictures into low stream codes, and outputs the low stream codes to the CPE, automatically recognizes the signals of different formats input by the camera and SDI embedded audio input, and sets the stream rate and resolution of the output video stream.
7. The system for adjusting a bit stream rate based on a wireless channel signal-to-noise ratio according to claim 5, wherein the CPE module receives a signal sent by the video transmission base station and analyzes the signal to obtain a reference signal received power value RSRP and a signal-to-interference-plus-noise ratio SINR of the system; and respectively comparing the RSRP value with the SINR value and the reference value, and adjusting the code rate speed by setting different code stream rate grades.
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| CN202020384397.XU CN211267010U (en) | 2020-03-24 | 2020-03-24 | System for adjusting code stream rate based on wireless channel signal-to-noise ratio |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113453023A (en) * | 2020-03-24 | 2021-09-28 | 福州市博讯网络科技有限公司 | System and method for adjusting code stream rate based on wireless channel signal-to-noise ratio |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113453023A (en) * | 2020-03-24 | 2021-09-28 | 福州市博讯网络科技有限公司 | System and method for adjusting code stream rate based on wireless channel signal-to-noise ratio |
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